I think the Yii 1.1.1 class reference for the CActiveRecord relations() method is outdated.
If I do understand correctly in Yii 1.1 columns do not have to be disambiguated manually by using ??.
Section "Additional options may be specified as name-value pairs in the rest array elements:" - still discribes the old way.
This was really giving me a headache when switching to Yii 1.1, I thought it was broken.